I
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Using Instrument Functions
Using Markers
To Use Multi-Peak or
Multi-Notch Search
Multi-peak and multi-notch searches are designed for use when measuring
multi-pole filters. Both searches automatically search the measurement trace
from left to right, and position a marker at each local maximum or minimum.
Up to eight maximums or minimums will be found. Searches are limited to
responses above -60
dB.
With marker tracking ON, the multi-peak/notch
search will be performed after each sweep.
NOTE
During a multi-peak or multi-notch search, eight markers are always placed on the trace, regardless of
how many peaks or notches are found. The markers that aren’t placed on a peak or notch are placed
at the far right of the display on the current maximum frequency point.
A maximum (or minimum) point is detected whenever an amplitude
excursion greater than half of a division occurs. The half of a division
excursion requirement must be satisfied on both sides (left and right) of the
peak (or minimum). The maximum (or minimum) point must be
>-60
dB.
See Figure 4-8.
-6OdB
5
All Meet
X Does Not Meet
Peak Search
Peak Search
Criteria
Criteria
112
Division
Figure 4-8. Peak and Minimum Search Criteria
4-17
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